An underwater diving mask comprising a face piece formed of suitable material so as to substantially conform to the contour of a diver's face, and a strap for releasably securing the face piece against the diver's face. The face piece has at least one opening formed in the forward part thereof for receiving a lens therein. The lens has an inner surface that is substantially flat (i.e. planar), and an outer surface that is slightly convex to thereby compensate for the magnification problem caused by the different indices of refraction between water and air. Preferably, the diopter value of the convex outer surface of the lens is between 0 and 1.0 so as to remove the lens from the domain of corrective lenses. A secondary corrective lens can, however, be affixed to the planar inner surface of the lens for those divers who would otherwise require corrective lenses. The lens is optionally treated to inhibit fogging, to reduce the amount of light reflected off the lens, to provide enhanced contrast imaging, and to protect divers from dangerous underwater radiation emissions.
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17. An underwater diving mask configured to cover a diver's eyes, said mask having at least one opening formed in the forward part thereof and at least one lens positioned within said opening, said lens of a non-uniform thickness and having a substantially planar inner surface facing toward the diver's face and a slightly convex outer surface facing away from the diver's face, wherein said slightly convex outer surface of said lens has a diopter value of between 0 and 1∅
11. A lens system installable into an underwater diving mask having at least one opening formed in the forward part thereof, said lens system comprising at least one lens of non-uniform thickness having a substantially planar inner surface that faces toward a diver's face when installed in the opening of the mask and a slightly convex outer surface that faces away from the diver's face when installed in the opening of the mask, wherein said slightly convex outer surface of said lens has a diopter value of between 0 and 1∅
9. An underwater diving mask comprising a face piece formed of suitable material so as to substantially conform to the contour of a diver's face and having at least one opening formed in the forward part thereof, means for releasably securing said face piece against the diver's face, and at least one lens of non-uniform thickness positioned within said opening of said face piece, said lens having a substantially planar inner surface facing toward the diver's face and a convex outer surface facing away from the diver's face with a diopter value of between 0 and 1∅
1. An underwater diving mask, comprising:
a face piece formed of suitable material so as to conform to the contour of a diver's face, said face piece having at least one opening formed in the forward part thereof; means for releasably securing said face piece against the diver's face; and at least one lens of non-uniform thickness positioned within said opening of said face piece, said lens having a substantially planar inner surface facing toward the diver's face and a slightly convex outer surface facing away from the diver's face, wherein the slightly convex outer surface of the lens has a diopter value of between 0 and 1∅
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12. The lens system of
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The present invention relates generally to underwater diving masks, and, more particularly, to a lens system that compensates for the magnification problem caused by the different indices of refraction between water and air.
Underwater diving masks are commonly used in a variety of underwater activities, such as scuba diving, snorkeling, underwater photography and the like. Conventional diving masks generally consist of a pre-formed face piece that fits over the diver's eyes and generally also the nose, and a strap that secures the face piece against the diver's face. Some diving masks have a single large opening formed in the forward part of the face piece, and a relatively flat transparent plate is mounted in the opening to enable the diver to view the surrounding marine environment. In other diving masks, two openings are formed in a side-by-side relationship in the forward part of the face piece (i.e. one for each eye of the diver), and a flat transparent plate is mounted in each opening.
While conventional diving masks serve the basic function of keeping water away from the diver's eyes, they have a number of disadvantages which are well known in the art. Most notably, because marine light is bent as it passes through the flat plate due to the different indices of refraction between water and air, objects viewed on an axis perpendicular to the plate appear approximately 33% larger and 25% closer than they actually are. The magnification of objects viewed off-axis is even larger. As a result, small objects in the water can be magnified out of proportion to their size, which can cloud the visual field. In addition, the diver's peripheral vision is severely compromised, resulting in what is commonly referred to as "tunnel vision."
The magnification problem associated with conventional diving masks has been addressed in the past by the use of complex lens systems. For example, U.S. Pat. No. 3,672,750 to Hagen discloses an underwater diving mask wherein a diver is required to look through several layers of material that have a refractive boundary between them. Another example is the underwater diving mask disclosed in U.S. Pat. Nos. 5,764,332 and 5,625,425 to Kranhouse, wherein the spherical centers of two hemispherically-shaped lenses are designed to coincide with the optical nodal points of the diver's eyes. While these diving masks purportedly compensate for the foreshortening effect of the water, their complex designs make them relatively difficult and expensive to manufacture. A further problem associated with the Kranhouse diving mask is the relatively large size (and thus weight) of the lenses, which makes the mask impractical for use by dry-suit divers who generally require lenses formed of tempered glass.
Another attempt to compensate for the different indices of refraction between water and air is shown in U.S. Pat. Nos. 5,359,371 and 5,523,804 to Nolan, the applicant of the present application. In these patents, an underwater diving mask is disclosed which includes a lens having a flat inner surface facing toward the diver's face and a concave outer surface facing away from the diver's face. Because the outer surface of the lens is concave (as opposed to flat), marine light intersects the lens normally and is transmitted therethrough without deviation.
In addition to the above-noted magnification problem, there are other disadvantages associated with conventional diving masks. For example, the air chamber between the support plate and the diver's face can easily fog up when the diver exhales through his or her nose. Another problem is that approximately 11% of marine light is reflected off the support plate, resulting in a visual field that appears dim to the eyes of the diver. Also, the diver's vision is compromised due to the fact that red and yellow hues are rapidly absorbed at 1-1.5 atmospheres. In addition, certain commercial and military activities (e.g. underwater gas and arc welding operations) can place divers at risk to radiation emissions that can pass through the support plate and have a deleterious effect on the nonregenerative ocular tissue of the divers'eyes.
Therefore, in view of the problems associated with the above-described diving masks, it is an object of the present invention to provide a diving mask having a lens system that 1) is designed to compensate for the different indices of refraction between water and air, 2) has a simple design that it is relatively easy and inexpensive to manufacture, 3) inhibits fogging, 4) reduces the amount of marine light reflected off the lens, 5) provides uncompromised vision, and 6) protects divers from the harmful effects of underwater radiation emissions.
These and other objectives are met by the plano-convex lens system for the underwater diving mask of the present invention. This diving mask generally consists of a face piece formed of suitable material so as to substantially conform to the contour of a diver's face, and a strap for releasably securing the face piece against the diver's face. The face piece has at least one opening formed in the forward part thereof for receiving a lens therein. The inner surface of the lens facing toward the diver's face is substantially flat (i.e. planar), and the outer surface of the lens facing away from the diver's face is slightly convex.
Preferably, the diopter value of the outer surface of the lens is between 0 and 1.0, and is most preferably between 0 and 0.5. These diopter values are sufficient to compensate for the magnification problem caused by the different indices of refraction between water and air, while remaining well out of range of the diopter values used for corrective vision. A secondary corrective lens can, however, be affixed to the flat inner surface of the lens for those divers who would otherwise require corrective lenses.
In one embodiment, the diving mask has a single large opening formed in the forward part of the face piece, and a large plano-convex lens is mounted within the opening to provide a closure therefor. In another embodiment, the diving mask has a single large opening formed in the forward part of the face piece, and a large transparent support plate is mounted within the opening to provide a closure therefor. The support plate itself is substantially flat on both sides, with the exception of a pair of plano-convex lenses integrally formed in a side-by-side relationship within the plate (i.e. a lens for each eye of the diver). In yet another embodiment, two openings are formed in a side-by-side relationship in the forward part of the face piece (i.e. an opening for each eye of the diver), and a plano-convex lens is mounted within each opening to provide a closure therefor.
The underwater diving mask of the present invention is also preferably designed to overcome other problems associated with conventional diving masks. For example, anti-fogging means may be applied to the inner surfaces of the plano-convex lenses to inhibit fogging. Also, an anti-reflectant coating may be applied to the plano-convex lenses for boosting the light transmission from 89% to 99.2%. In addition, to provide enhanced contrast imaging and/or protect the diver from ionizing and non-ionizing radiation emissions associated with dangerous underwater work (such as gas and arc welding operations), the plano-convex lenses may be treated or coated with a coloring agent to inhibit the passage therethrough of certain wavelengths of light. The plano-convex lenses may be polarized for this same purpose.
The present invention will be better understood from the following detailed description of the invention, read in connection with the drawings as hereinafter described.
The present invention is directed to an underwater diving mask having a plano-convex lens system that is designed to compensate for the different indices of refraction between water and air. While the invention will be described hereinbelow with regard to specific embodiments, it should be understood that various design modifications could be made to these embodiments without departing from the scope of the present invention.
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In all of the embodiments, lenses 24a and 24b, 30, and 44a and 44b can be formed of any transparent material that will enable the diver to view the surrounding marine environment. Preferably, the lenses are formed of optical quality material, such as optical quality polycarbonate (e.g. the polycarbonate obtainable from General Electric under the trademark LEXAN) or tempered glass (e.g. any tempered glass in conformance with the ANSI Z86:1985 standard).
As described and illustrated hereinabove, the inner surfaces of lenses 24a and 24b, 30, and 44a and 44b are substantially flat. These flat inner surfaces permit modification through tooling or the affixation of a secondary corrective lens for those divers who would otherwise require corrective lenses. For example, as shown in
As also described and illustrated hereinabove, the outer surfaces of lenses 24a and 24b, 30, and 44a and 44b are slightly convex. It should be understood that the lenses described in U.S. Pat. Nos. 5,359,371 and 5,523,804 to Nolan, the inventor of the present invention, are configured to have a slightly concave outer surface. It should be noted that, since issuance of these patents, the applicant has determined through experimental trial that structural convexity has the same compensating effect on marine light as structural concavity.
Preferably, the diopter value of the convex outer surface of the lens is between 0 and 1.0, and is most preferably between 0 and 0.5. These diopter values are sufficient to compensate for the magnification problem caused by the different indices of refraction between water and air, while remaining well out of range of the diopter values used for corrective vision. As such, the distortion of objects viewed out of the water (i.e. in air) is inconsequential. However, as described above, a secondary corrective lens can be affixed to the planar inner surface of the lens for those divers who would otherwise require corrective lenses.
It can be seen that the plano-convex lens of the present invention is structurally different from the flat support plate of conventional diving masks. In conventional diving masks, marine light intersects the flat support plate obliquely and is thereby refracted. By contrast, marine light intersects the convex outer surface of the lens normally and is transmitted therethrough without deviation. Consequently, the diver detects no distortions and accurately perceives the underwater environment. As a result, the visual field is unclouded by magnified distractions so that the diver can see further into the water column. In addition, the diver's peripheral visibility is more than double that of conventional diving masks.
The underwater diving mask of the present invention may also be treated to overcome other problems associated with conventional diving masks. For example, the plano-convex lenses of the present invention are preferably treated to reduce the likelihood of impaired underwater visibility attributable to lens fogging. Advex coatings from Miller Visual Dynamics of Clearfield, Utah, or HC/AF Glass Coating from V-TEC, Inc. of Chestnut Hill, Mass., or any other suitable anti-fogging means can be applied to the inner surfaces of the lenses to inhibit fogging, as is known in the art.
Also, the plano-convex lenses of the present invention are preferably designed to boost the amount of light transmitted through the lenses so as to provide a brighter visual field as compared to that of conventional diving masks. Thus, a suitable anti-reflective coating (such as Pentax AR Coating from Pentax Corporation of Englewood, Colo.) can be applied to the lens to boost the light transmission from 89% to 99.2%.
In addition, to reduce color distortion and/or provide protection from dangerous underwater radiation emissions, the plano-convex lenses of the present invention are preferably treated or coated with a coloring agent to inhibit the passage therethrough of certain wavelengths of light. One such agent the applicant has found to work well is a material available from Morton International of Lansing, Mich., referred as LS-123. Alternatively, the lenses may be formed with material that is already colored as desired. By introducing strategic color blocks within the 400 nm-580 nm spectral band (i.e. the blue-green range), significant improvements are achieved, not in color vision, but in contrast imaging which enables the naked eye to detect the presence of otherwise indiscernible objects from the natural background. In addition, non-ionizing lens blocks define a preventative health strategy for the congealment of critical ocular tissue. The plano-convex lenses of the present invention may also be polarized for the same purpose.
While the underwater diving mask of the present invention has been described and illustrated hereinabove with regard to specific embodiments, it should be understood that various design modifications could be made to these embodiments without departing from the scope of the present invention. For example, as described above, a plano-convex lens could be mounted in an opening formed in the forward part of a diving helmet. Also, a plano-convex replacement lens could be installed or retrofitted in an existing diving mask. Therefore, it can be seen that the present invention is not to be limited to these specific embodiments, except insofar as such limitations are included in the following claims.
Patent | Priority | Assignee | Title |
10073282, | Nov 13 2014 | Oakley, Inc | Eyewear with variable optical characteristics |
10345623, | Apr 15 2010 | Oakley, Inc. | Eyewear with chroma enhancement |
10401652, | Apr 15 2010 | Oakley, Inc. | Eyewear with chroma enhancement |
10502980, | Apr 15 2010 | Oakley, Inc. | Eyewear with chroma enhancement |
10871661, | May 23 2014 | Oakley, Inc | Eyewear and lenses with multiple molded lens components |
10976574, | Apr 15 2010 | Oakley, Inc. | Eyewear with chroma enhancement |
11048103, | Nov 13 2014 | Oakley, Inc. | Eyewear with variable optical characteristics |
11099408, | Jan 10 2014 | Oakley, Inc. | Eyewear with chroma enhancement |
11112622, | Feb 01 2018 | LUXOTTICA S.R.L. | Eyewear and lenses with multiple molded lens components |
11397337, | Apr 15 2010 | Oakley, Inc. | Eyewear with chroma enhancement |
11474382, | Apr 15 2010 | Oakley, Inc. | Eyewear with chroma enhancement |
11579470, | May 10 2012 | Government of the United States as Represented by the Secretary of the Air Force | Lens with anti-fog element |
11762221, | Jan 10 2014 | Oakley, Inc. | Eyewear with chroma enhancement |
7498634, | Jan 10 2006 | Denso Corporation | Semiconductor device having IGBT and diode |
8770749, | Apr 15 2010 | Oakley, Inc | Eyewear with chroma enhancement |
9134547, | Oct 20 2011 | Oakley, Inc | Eyewear with chroma enhancement |
9383594, | Apr 15 2010 | Oakley, Inc. | Eyewear with chroma enhancement |
9575335, | Jan 10 2014 | Oakley, Inc | Eyewear with chroma enhancement for specific activities |
9905022, | Jan 16 2015 | Oakley, Inc. | Electronic display for demonstrating eyewear functionality |
9910297, | Jan 10 2014 | Oakley, Inc. | Eyewear with chroma enhancement |
D794700, | Sep 11 2015 | SUN SCALE SZ MANUFACTURING LIMITED | 3D glasses |
Patent | Priority | Assignee | Title |
3051957, | |||
3055256, | |||
3672750, | |||
5359371, | May 03 1990 | Lens system for diver's mask | |
5523804, | May 03 1990 | Lens system for diver's mask | |
5625425, | Aug 28 1991 | Diving mask with lenses and method of fabricating the same | |
5764332, | Aug 28 1991 | Diving mask with lenses and method of fabricating the same | |
5777712, | Nov 25 1988 | Diving mask | |
FR1374010, | |||
JP63109412, |
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